Maximiliano Viale, Raúl Valenzuela, René Garreaud, F. Martin Ralph,
Abstract This study quantifies the impact of atmospheric rivers (ARs) on precipitation in southern South America. An AR detection algorithm was developed based on integrated water vapor transport (IVT) from 6-hourly CFSR reanalysis data over a 16-yr period (2001–16). AR landfalls were linked to precipitation using a comprehensive observing network that spanned large variations in terrain along and across the Andes from 27° to 55°S, including some sites with hourly data. Along the Pacific (west) coast, ...
Tópico(s): Tropical and Extratropical Cyclones Research
2018 - American Meteorological Society | Journal of Hydrometeorology
Raúl Valenzuela, René Garreaud,
Abstract Extreme rainfall events are thought to be one of the major threats of climate change given an increase of water vapor available in the atmosphere. However, before projecting future changes in extreme rainfall events, it is mandatory to know current patterns. In this study we explore extreme daily rainfall events along central-southern Chile with emphasis in their spatial distribution and concurrent synoptic-scale circulation. Surface rain gauges and reanalysis products from the Climate ...
Tópico(s): Cryospheric studies and observations
2019 - American Meteorological Society | Journal of Hydrometeorology
Raúl Valenzuela, René Garreaud, Iván Vergara, Diego Campos, Maximiliano Viale, Roberto Rondanelli,
A major storm impacted the subtropical Andes during 28–31 January 2021 producing 4-days accumulated precipitation up to 100 mm over central-south Chile. These are high accumulations even for winter events but the storm occurred in the middle of the summer when precipitation is virtually absent, conferring it an extraordinary character. Similar storms have occurred only 2–3 times in the past century. The January 2021 event included periods of high rainfall intensity, hail and lighting, causing dozens ...
Tópico(s): Tropical and Extratropical Cyclones Research
2022 - Elsevier BV | Weather and Climate Extremes
Héctor Gutiérrez‐Espinoza, Felipe Araya‐Quintanilla, Cristian Olguín‐Huerta, Juan José Valenzuela-Fuenzalida, René Jorquera, Rodrigo Gutiérrez-Monclus, Jaime Castillo-Alcayaga, Patricio Retamal-Pérez,
Background: The effectiveness of Manual Therapy (MT) in thumb carpometacarpal osteoarthritis (OA) is unclear.Objective: This study aimed to determine the effectiveness of MT for functional outcomes in patients with thumb carpometacarpal OA. Design: Systematic review and meta-analysis of randomized clinical trials. Methods: An electronic search was performed in the Medline, Central, Embase, PEDro, Lilacs, Cinahl, SPORTDiscus, and Web of Science databases. The eligibility criteria for selecting studies ...
Tópico(s): Intramuscular injections and effects
2021 - Taylor & Francis | Physiotherapy Theory and Practice
José M. Vicencio, Roberto Rondanelli, Diego Campos, Raúl Valenzuela, René Garreaud, Alejandra Reyes, Rodrigo Padilla, Ricardo Abarca, Camilo Barahona, Rodrigo Delgado, Gabriela Nicora,
Abstract In late May 2019, at least seven tornadoes were reported within a 24-h period in southern Chile (western South America, 36°–38°S), including EF1 and EF2 events causing substantial damage to infrastructure, dozens of injuries, and one fatality. Despite anecdotal evidence and chronicles of similar historical events, the threat from tornadoes in Chile was regarded with skepticism until the 2019 outbreak. Herein, we describe the synoptic-scale features instrumental in the development of these ...
Tópico(s): Tropical and Extratropical Cyclones Research
2020 - American Meteorological Society | Bulletin of the American Meteorological Society
Jaquelyn Valenzuela-Millán, José René Barrera-Serrano, José Manuel Ornelas-Aguirre,
summary Background: Preoperative anxiety is a common and poorly evaluated condition in patients who will undergo an anesthetic and surgical intervention. The objective of this study was to determine the prevalence of anxiety in a group of patients undergoing elective surgery, as assessed by the Amsterdam Anxiety Preoperative and Information (AAPI) scale. methods: We studied 135 patients scheduled for elective surgery applying the AAPI scale 24 h before the surgical procedure to evaluate the presence ...
Tópico(s): Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes
2010 - Elsevier BV | Cirugía y Cirujanos
Mauricio Pereira, René Valenzuela, M. Aníbal Valenzuela,
The presence of a condensate in dryer cylinders during the startup produces an important increase of the required torque and power that adversely affects the drive and mechanical components of the drive train. This paper presents a complete evaluation of the condensate effects in an experimental setup with a 380-mm-diameter cylinder, during operation without and with spoiler bars, and covering from 1% up to 30% of condensate load, and up to 500 r/min. Sets of pictures showing the condensate profile ...
Tópico(s): Real-time simulation and control systems
2010 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Industry Applications
Beatriz Valenzuela, Mónica Imarai, René Torres, Brenda Modak,
Fish farming crops are constantly exposed to infectious diseases due to intensive production conditions under which microorganisms develop and spread easily, resulting in severe economic losses. The massive use of antibiotics to control these diseases has lead to the accumulation of residues and the development of drug resistance. Consequently, it is urgent to develop new pharmacological tools to stimulate protective immune responses in salmonids to combat infectious diseases. We evaluated the immunostimulant ...
Tópico(s): Bioactive Compounds and Antitumor Agents
2013 - Elsevier BV | Developmental & Comparative Immunology
Produção Nacional
Revisado por pares
Juan Diego Valenzuela-Cobos, René Oscar Rodríguez-Grimón, Diego Cunha Zied, Ana Grijalva-Endara, María Fernanda Garcés-Moncayo, María Eugenia Garín-Aguilar, Abraham Sánchez-Hernández, Gustavo Valencia del Toro,
The productivity parameters of 2 Pleurotus spp. cultivated with two mixtures of wheat straw (WS) and peat moss (MG) were evaluated, the chemical composition of the mushrooms and also the antioxidant, antibacterial activities of hexanic extracts of the fruit bodies were determined. Pleurotus strains were fructified using the mixture 1 (60% of WS + 40% of MG) obtained the highest biological efficiencies, production rates and yields. The strain of Pleurotus ostreatus (XC005) cultivated using the mixture ...
Tópico(s): Medicinal plant effects and applications
2019 - United Arab Emirates University | Emirates Journal of Food and Agriculture
Vitali Volovoi, René Valenzuela,
While the complexity of modern engineering systems is significantly mitigated by modularization, the number of modules (e.g., line-replaceable units) can still be large enough to pose a challenge of developing a coordinated maintenance policy that accounts for the coupling among individual maintenance schedules for each module. This paper focuses on opportunistic maintenance, induced failure, and other coupling mechanisms caused by competing risk phenomena. Modeling the maintenance process of an ...
Tópico(s): Software Reliability and Analysis Research
2012 - Elsevier BV | International Journal of Engineering Science
Vitali Volovoi, Alexandra Balueva, Rene Valenzuela Vega,
... Automated Collision Avoidance SystemsVitali Volovoi, Alexandra Balueva and Rene Valenzuela VegaVitali VolovoiSchool of Aerospace Engineering, Georgia Institute of ... Search for more papers by this author and Rene Valenzuela VegaSchool of Aerospace Engineering, Georgia Institute of Technology, ...
Tópico(s): Human-Automation Interaction and Safety
2013 - American Institute of Aeronautics and Astronautics | Journal of Guidance Control and Dynamics
José Manuel Hernández de la Cruz, Mildreth Liliet,
Tópico(s): Public Policy and Governance
2009 - SAGE Publishing | Acta Sociologica
Melissa Nassif, Vicente Valenzuela, Diego Rojas‐Rivera, René L. Vidal, Soledad Matus, Karen Castillo, Yerko Fuentealba, Guido Kroemer, Beth Levine, Claudio Hetz,
Pharmacological activation of autophagy is becoming an attractive strategy to induce the selective degradation of aggregate-prone proteins. Recent evidence also suggests that autophagy impairment may underlie the pathogenesis of several neurodegenerative diseases. Mutations in the gene encoding SOD1 (superoxide disumutase 1) trigger familial amyotrophic lateral sclerosis (ALS), inducing its misfolding and aggregation and the progressive loss of motoneurons. It is still under debate whether autophagy ...
Tópico(s): Parkinson's Disease Mechanisms and Treatments
2014 - Taylor & Francis | Autophagy
Sandybell González Lugo, José Concepción Gaxiola Romero, Édgar René Valenzuela Hernández,
Durante la adolescencia existe una mayor vulnerabilidad al desajuste psicológico cuando se experimenta un suceso de vida estresante; sin embargo, existen factores protectores que pueden ayudar al adolescente a gozar de bienestar psicológico a pesar de dichos riesgos. El objetivo del presente estudio fue evaluar el papel del apoyo social y las disposiciones a la resiliencia sobre el bienestar psicológico de adolescentes con sucesos de vida reportados mediante un modelo de trayectorias. Previa frma ...
Tópico(s): Aging, Health, and Disability
2018 - Universidad Veracruzana | Psicología y Salud
Heliodoro Alemán-Mateo, Miriam T. López-Teros, Roxana E. Ruiz Valenzuela, Maribel Ramírez-Torres, René Urquídez-Romero,
Background . Variation in the prevalence of sarcopenia is related to the skeletal muscle index cutoff points applied. The objective of this pilot study was to examine the recruitment process for testing different sarcopenia definitions (ASMI cutoffs) in older Mexican adults. It explored whether the prevalence of sarcopenia decreased by applying ethnic- and gender-specific, DXA-derived appendicular skeletal muscle index (ASMI)-cutoff points in the definitions, as well as some associated factors in a ...
Tópico(s): Clinical Nutrition and Gastroenterology
2020 - Hindawi Publishing Corporation | Current Gerontology and Geriatrics Research
Mariana Jimenez, Nicolás Velásquez, Jhon Esteban Jimenez, Janet Barco, Daniela Blessent, Jacqueline López-Sánchez, Sebastián Córdoba Castrillón, Carlos Valenzuela, René Therrien, Vinicius Ferreira Boico, J. C. Múnera,
The La Miel River watershed is an area of high hydrological interest in Colombia due to its abundant water resources, high annual precipitation, and hydroelectric power generation. This work proposes a sequential modeling framework to quantify the spatially and temporally variable groundwater recharge and to analyze its impact on piezometric fluctuations in the study area, where the groundwater flow is affected by geological faults. Water Modeling Framework (WMF) and HydroGeoSphere (HGS) models have ...
Tópico(s): Reservoir Engineering and Simulation Methods
2022 - Elsevier BV | Environmental Modelling & Software
Priscila Moraga S., René Escobar, Sofia Valenzuela A.,
Tópico(s): Turfgrass Adaptation and Management
2006 - Elsevier BV | Electronic Journal of Biotechnology
Valeria Zermeño, Cecilia Ximénez, Patricia Morán, Alicia Valadéz, Olivia Valenzuela, Edgar Rascón-Castelo, Daniel Díaz, René Cerritos,
Although Entamoeba histolytica is one of the most prevalent intestinal parasites, how the different strains of this species are distributed all over the world and how different genotypes are associated with the infection outcome are yet to be fully understood. Recently, the use of a number of molecular markers has made the characterization of several genotypes in those regions with high incidence of amoebiasis possible. This work proposes the first genealogy of E. histolytica, with an haplotype ...
Tópico(s): Diagnosis and treatment of tuberculosis
2013 - Elsevier BV | Infection Genetics and Evolution
Ute Woehlbier, Alicia Colombo, Mirva J. Saaranen, Viviana Pérez, Jorge Ojeda, Fernando J. Bustos, Catherine I. Andreu, Mauricio Torres, Vicente Valenzuela, Danilo B. Medinas, Pablo Rozas, René L. Vidal, Rodrigo López‐González, Johnny Salameh, Sara Fernández‐Collemann, Natalia Albornoz, Soledad Matus, Ricardo Armisén, Alfredo Sagredo, Karina Palma, Thergiory Irrazábal, Sandra Almeida, Paloma González-Pérez, Mario Campero, Fen‐Biao Gao, Pablo Henny, Brigitte van Zundert, Lloyd W. Ruddock, Miguel L. Concha, Juan Pablo Henríquez, Robert H. Brown, Claudio Hetz,
Abstract Disturbance of endoplasmic reticulum ( ER ) proteostasis is a common feature of amyotrophic lateral sclerosis ( ALS ). Protein disulfide isomerases ( PDI s) are ER foldases identified as possible ALS biomarkers, as well as neuroprotective factors. However, no functional studies have addressed their impact on the disease process. Here, we functionally characterized four ALS ‐linked mutations recently identified in two major PDI genes, PDIA 1 and PDIA 3/ ER p57. Phenotypic screening in zebrafish revealed ...
Tópico(s): Neurogenetic and Muscular Disorders Research
2016 - Springer Nature | The EMBO Journal
Christian Staufner, Bianca Peters, Matias Wagner, Seham Alameer, Ivo Barić, Pierre Broué, Fatma Derya Bulut, Joseph A. Church, Ellen Crushell, Buket Dalgıç, Anibh M. Das, Anke Dick, Nicola Dikow, Carlo Dionisi‐Vici, Felix Distelmaier, Neslihan Ekşi Bozbulut, François Feillet, Emmanuel Gonzalès, Nedim Hadžić, Fabian Hauck, Robert Hegarty, Maja Hempel, Theresia Herget, Christoph Klein, Vassiliki Konstantopoulou, Robert Kopajtich, Alice Kuster, Martin W. Laaß, Elke Lainka, Catherine Larson‐Nath, Alexander Leibner, Eberhard Lurz, Johannes A. Mayr, Patrick McKiernan, Karine Mention, Ute Moog, Neslihan Önenli Mungan, Korbinian M. Riedhammer, René Santer, Irene Valenzuela, Jerry Vockley, Dominik S. Westphal, Arnaud Wiedemann, Saskia B. Wortmann, Gaurav D. Diwan, Robert B. Russell, Holger Prokisch, Sven F. Garbade, Stefan Kölker, Georg F. Hoffmann, Dominic Lenz,
Pathogenic variants in neuroblastoma-amplified sequence (NBAS) cause an autosomal recessive disorder with a wide range of symptoms affecting liver, skeletal system, and brain, among others. There is a continuously growing number of patients but a lack of systematic and quantitative analysis.Individuals with biallelic variants in NBAS were recruited within an international, multicenter study, including novel and previously published patients. Clinical variables were analyzed with log-linear models ...
Tópico(s): Genetics and Neurodevelopmental Disorders
2019 - Elsevier BV | Genetics in Medicine
Fernando G. Noriega, José M. C. Ribeiro, J. F. Koener, Jesús G. Valenzuela, Salvador Hernández‐Martínez, Van My Pham, René Feyereisen,
The biosynthesis of insect juvenile hormone (JH) and its neuroendocrine control are attractive targets for chemical control of insect pests and vectors of disease. To facilitate the molecular study of JH biosynthesis, we analyzed ESTs from the glands producing JH, the corpora allata (CA) in the cockroach Diploptera punctata, an insect long used as a physiological model species and compared them with ESTs from the CA of the mosquitoes Aedes aegypti and Anopheles albimanus. The predicted genes were ...
Tópico(s): Insect and Arachnid Ecology and Behavior
2006 - Elsevier BV | Insect Biochemistry and Molecular Biology
S Priscila Moraga, René Escobar, A. Valenzuela,
The resistance to low temperatures was assessed in seedlings of three subspecies of E. globulus (ssp globulus, ssp bicostata and ssp maidenii) of two different provenances. Lethal temperature 50 (LT50) was obtained by measuring the electrolytic conductivity, nucleation and freezing temperatures were obtained by thermal analysis and the total soluble carbohydrates concentration was determined through the phenolsulphuric method. Results showed that the most resistant provenance corresponded to Bolaro ...
Tópico(s): Fire effects on ecosystems
2006 - Elsevier BV | Electronic Journal of Biotechnology
Gabriel Estrella Valenzuela, René Zenteno,
En este trabajo de investigación se analiza el contexto de integración de la mujer al mercado laboral urbano durante un periodo crucial en la historia reciente de México. La perspectiva comparativa de seleccionar 16 ciudades para el análisis permite capturar los patrones de cambio general de este contexto al igual que su diversidad. Los resultados permiten señalar lo siguiente. Primero, que con excepción de algunas ciudades norteñas, principalmente fronterizas, la estructura del empleo urbano mostró ...
Tópico(s): Mexican Socioeconomic and Environmental Dynamics
1999 - El Colegio de México | Estudios Demográficos y Urbanos
Miguel Ángel Rivera Pérez, Bertha Karina Quezada González, Marlon Quiñónez Espinoza, Ramón René Almada Valenzuela,
Introducción: Se estima que la mitad de los pacientes con estoma intestinal van a tener complicaciones.En ocasiones, no se logrará un adecuado control de la fuga intestinal libre a la cavidad abdominal.Para estas situaciones, se diseñó una férula de látex al cabo distal intestinal, para exteriorizar el material intestinal y evitar la contaminación tanto química como bacteriana hacia la cavidad abdominal.material y métodos: Se realizó una recolección prospectiva de pacientes con estoma complicado ...
Tópico(s): Anorectal Disease Treatments and Outcomes
2017 - Elsevier BV | Cirujano General
Produção Nacional
Revisado por pares
V. Alcaraz‐González, Guillermo Rodriguez–Valenzuela, Juan Jose Gomez–Martinez, Guilherme Luiz Dotto, René Alejandro Flores–Estrella,
In this paper, two control laws are proposed and applied in a model for a continuous Microbial Electrochemical Cells system. The used model is based on mass balances describing the behavior of substrate consumption, microbial growth, competition between anodophilic and methanogenic microorganisms for the carbon source in the anode, hydrogen generation, and electrical current production. The main control objective is to improve the electrical current generated and thus the production of bio-hydrogen ...
Tópico(s): Anaerobic Digestion and Biogas Production
2020 - Elsevier BV | Journal of Environmental Management
Diana Beatriz Rangel Peniche, Heliodoro Alemán-Mateo, Ma. de los Angeles Aguilera Barreiro, Roxana E. Ruiz Valenzuela, Maribel Ramírez-Torres, René Urquídez-Romero,
Mexico is a country that is rich in ethnicity and cultural diversity, divided into three well-defined socioeconomic, ecological, and epidemiological areas. However, we do not know the influence that these factors may have on body composition. Therefore, this study was designed to assess body composition and compare appendicular skeletal muscle mass (ASM) in older people from two areas of the country.
Tópico(s): Nutritional Studies and Diet
2018 - Hindawi Publishing Corporation | BioMed Research International
Gerardo Álvarez-Hernández, Christopher D. Paddock, David H. Walker, Jesús G. Valenzuela, Jesús René Tadeo Calleja-López, Cristian Noé Rivera-Rosas, Rogerio R. Sotelo‐Mundo,
Rocky Mountain spotted fever (RMSF), a severe and extraordinarily lethal infectious disease, has emerged as a widespread public health crisis among predominantly vulnerable populations in several countries of Latin America, particularly evident in northern Mexico. Historically, RMSF has gained less attention than many other tropical infectious diseases, resulting in insufficient allocations of resources and development of capabilities for its prevention and control in endemic regions. We argue that ...
Tópico(s): Vector-borne infectious diseases
2024 - Public Library of Science | PLoS neglected tropical diseases
Produção Nacional
Revisado por pares
Angel Visentim Ortiz, Jaciele G. Teixeira, Michelle Garcia Gomes, René R. Oliveira, Francisco Rolando Valenzuela Díaz, Esperidiana A. B. Moura,
This work evaluates the morphology, mechanical and thermo-mechanical properties of high density polyethylene (HDPE) composites. HDPE reinforced with rice husk ashes (80:20 wt%), HDPE reinforced with clay (97:3 wt%) and HDPE reinforced with both rice husk ashes and clay(77:20:3 wt%) were obtained. The Brazilian bentonite chocolate clay was used in this study. This Brazilian smectitic clay is commonly used to produce nanocomposites. The composites were produced by melting extrusion process and then irradiation ...
Tópico(s): Natural Fiber Reinforced Composites
2014 - Elsevier BV | Applied Surface Science
Edison Javier Matamala-Cea, Fabián Valenzuela-Godoy, Déborah González, Rodrigo Arancibia, Vincent Dorcet, Jean‐René Hamon, Néstor Novoa,
The symmetrical meso-tetrasubstituted porphyrin 5,10,15,20-tetrakis(4-bromophenyl)Porphyrin (1) has been synthesized in quite high yields, ranging from 55 – 78%, by conventional and microwave assisted techniques, and isolated as a microcrystalline compound. The products obtained in each case have been characterized by 1H NMR, Mass spectrometry, elemental analysis and Thin layer chromatography. The X-ray crystal structure of 1 is reported for the first time, and reveals a planar disposition of the center ...
Tópico(s): Molecular Sensors and Ion Detection
2019 - Elsevier BV | Journal of Molecular Structure
Blanca Dina Valenzuela, Olivia Graciela Fragoso Díaz, René Santaolaya Salgado, Jaime Muñoz,
The availability of educational resources on the Web is an efficient way of acquiring and sharing the knowledge through e-Learning. Nowadays there are hundreds of learning objects on the Internet; these objects are developed under e-Learning specifications and standards, such as SCORM and IMS Content Package. These standards allow the use of learning objects in learning management systems. However, learning environments and learning objects must have been built to the same standards. In this sense, ...
Tópico(s): E-Learning and Knowledge Management
2017 - Institute of Electrical and Electronics Engineers | IEEE Latin America Transactions